Help to use Siril Without DOF on MACOS

yes I tried to check but I can’t figure out how to manage.
I check PSF dynamic tool but i’ts not enable on the menu.
Then do I still have to use pre process script ?
more and more I try to stack an image and the more I feel lost.
I can’t find a full tuto or video showing how to proceed.
I will continu to investigate
thanks again for your help
Regards